Re: [Xen-devel] [PATCH v2 7/7] amd/pvh: enable ACPI C1E disable quirk on PVH Dom0

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.10.18 at 17:20, <roger.pau@xxxxxxxxxx> wrote:
> --- a/xen/arch/x86/hvm/svm/svm.c
> +++ b/xen/arch/x86/hvm/svm/svm.c
> @@ -1272,6 +1272,24 @@ void svm_host_osvw_init()
>      spin_unlock(&osvw_lock);
>  }
>  
> +static int acpi_c1e_quirk(int dir, unsigned int port, unsigned int bytes,
> +                          uint32_t *val)
> +{
> +    ASSERT(bytes == 1 && port == acpi_smi_cmd);
> +
> +    if ( dir == IOREQ_READ )
> +    {
> +        *val = inb(port);
> +        return X86EMUL_OKAY;
> +    }
> +
> +    outb(*val, port);
> +    if ( *val == acpi_enable_value )
> +       on_each_cpu(amd_disable_c1e, NULL, 1);
> +
> +    return X86EMUL_OKAY;
> +}

Nothing in here nor ...

> @@ -1284,6 +1302,9 @@ static int svm_domain_initialise(struct domain *d)
>  
>      svm_guest_osvw_init(d);
>  
> +    if ( amd_acpi_c1e_quirk )
> +        register_portio_handler(d, acpi_smi_cmd, 1, acpi_c1e_quirk);

... the registration here restricts this to Dom0.

Jan



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